<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>

    </style>
</head>
<body>
<!--
    E:first-child==E:nth-child(1)
    E:last-child==E:nth-last-child(1)

    E:first-of-type==E:nth-of-type(1)
    E:last-of-type==E:nth-last-of-type(1)

-->
</body>
</html>